Background A tenth of a population in Denmark today is the result of assisted fertility, including IVF and ICSI. In roughly 40 % of these subfertile women the reason is unknown. Standard initial procedures include transvaginal ultrasonography, with or without saline infusion to detect intrauterine abnormalities that might explain the infertile condition. The golden standard to detect intrauterine abnormalities is hysteroscopy. Such abnormalities can be detected in a fourth of this population. Earlier studies indicate that the hysteroscopy alone - without correcting any abnormalities, affects IVF/ISCI outcome positively.